Wooooooooooooooooow one of the best game I've played so far! Strangely enough, the "UFO" angle was not used a lot in the jam, but your take is truly original!
The art is really good, the music is very fitting, the ambiance is outstanding and the gameplay is a lot of fun! Yeah, there are some bugs here and there and the game lacks a little bit of polish, but come on, for a 7 days jam, that's a LOT of work, and a lot of love you've put in a game.
My only true complain is about the controls, I didn't really enjoyed the mouse interactions, I would have prefered a keyboard-only solution, but that's just some nitpicking.
Honestly, even without the jam context, this is a very unusual twist for a farming game, and I would love to see it expanded, with more incentive to go farther from the farm and some defense mechanism to allow us to gain some time. Please, please, ping me if you update the game. With some more content and polish, that could go to Steam, and be a great success!
Congratulations, you can be proud of yourselves!